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Problem　and　Improvement　of　Kissinger　Method──New　Method　on　Measuring　crystallization　activation　energy　of　Amorphous　Alloy

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Journal of Iron and Steel Research International 1996年第2期3卷 49-53页

作者： Cao Xingguo Che Xiaozhou Liu Ping Guo Zechen Luoyang Institute of Technology Henan 471039 China

By measuring and analyzing the crystallization activation energy (CAE) of Fe-based amorphous alloy Fe79B16Si5 and Fe78B13Si9, it is reconfirmed and further analyzed that the conventional Kissinger method does not conform with the premise of Kissinger equation, namely, samples with different heating rates should keep a constant fraction of transformation at the exothermal peak temperature Tp of DSC thermogram. The XRD equal first peak height (EFPH) method is applied to CAE measurement of Fe-based amorphous alloy for the first time. It is shown again that the EFPH method coincides with the premise of Kissinger equation. The procedure of EFPH method is introduced in detail in this paper. The accuracy in determining CAE of amorphous alloy may be improved by applying the EFPH method. As a result, the mechanism of embrittlement of amorphous alloy may be better elucidated.

关键词： Kissinger method crystallization activation energy amorphous alloy

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Effect of glass network modifier R_2O(R=Li, Na and K) on upconversion luminescence in Er^(3+)/Yb^(3+) co-doped NaYF_4 oxyfluoride glass-ceramics

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Journal of Rare Earths 2015年第8期33卷 830-836页

作者：高源胡曰博任鹏周大成邱建备 Faculty of Material Science and Engineering Kunming University of Science and Technology Faculty of Mechanical and Electrical Engineering Kunming University of Science and Technology Key Laboratory of Advanced Materials of Yunnan Province

The effect of glass network modifier R2O （R=Li, Na, K） on upconversion luminescence in Er3＋/yb3＋ co-doped NaYF4 oxyfluoride glass-ceramics was investigated. NaYF4 nanocrystals with different sizes were studied under glass network modifier alkali mental oxide. The nanocrystals size in NaYF4 of Li2O modified samples was 11 nm, whereas in the Na20 and K2O modified sample, the crystal size was 25 and 43 nm, respectively. It was found that red, yellow and green upconversions were observed in SAL, SAN, SAK glass ceramics. The reported results would deepen the understanding of size effects on the lanthanide upcon- version in nanocrystals.

关键词： upconversion luminescence glass network modifier glass ceramics crystallization activation energy rare earths

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Investigation on crystallization Kinetics of 70GeS_2-20Sb_2S_3-10CsCl Chalcogenide Glass

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Journal of Wuhan University of Technology(Materials Science) 2007年第B12期22卷 803-805页

作者：聂秋华金珍娟 Faculty of Information Science and Engineering The State Key Laboratory Base of Novel Functional Materials and Preparation ScienceNingbo University

The kinetics of crystallization in 70GeS2-20Sb2S3-10CsCl chalcogenide glass was studied using differential scanning calorimetry （DSC） at different heating rate. The values of glass transition and crystallization temperatures were found to be heating rate dependent. Using Matusita method, the crystallization activation energies E and crystallization parameter （n） calculated are 348.08±0.99 kJ/mol and 1.78. It suggests that there are two mechanisms： a surface and one-dimensional crystallization processes.

关键词： glass-ceramics DSC crystallization kinetics crystallization activation energy

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